I don't know how the primary was fixed to the tube on the 20" Meade, but there was no movement because the corrector moved in and out on 3 encoded threaded rods for focus.
My experience with the scope and Meade was very positive and has been the subject of several threads here since I acquired it. Except for one year when it went unused in a Wellsboro, PA observatory due to drilling burn-off and illuminated browned skies, the scope traveled extensively; three times back to Meade for mount upgrades, and many star parties. In 2013, it returned from Meade the last time, just before the company's change in ownership. It had been sold for drop shipment delivery from Meade to a French institution in Polynesia. The buyer ultimately defaulted and walked away from a 6 figure deposit. So it returned to me and after a year engaged in a mild international legal dispute, I uncrated it then did a five month expedition with it West of the Dakotas. I used it visually with the Denkmier LOA's while 2 or 3 other triplets were hanging on the Max Mount using machined brackets equipped with various DSLRs and a QSI 683.
With either 13 or 21 mm Ethos oculars, the views remain unmatched by any of the many scopes that I've peered through or owned. Twenty inches at f/8 shows color on the best of nights at resolutions that truly "put you there". The ACF (RCX) optics are superb with pin point stars and contrast that seems to make filaments glow against an inky background. One needn't twist a focuser back and forth trying to pinch out just a little, itsy....bitsy... more....detail. With this scope the resolution suddenly explodes on one's consciousness at 300X sucking your breath away. The full travel of the corrector plate is about an inch and a quarter. I hung a 3" Optec TCF on the back to take the load off the main focuser out of fear when Meade changed hands.
So why was it sold again? Well, a scope of this heft and dimension demands the fairest, darkest skies. I can say that in nine years of use I encountered 15 perfect nights with it - just enough to fuel an intractable obsession. The equipment to transport it behind the front sometimes 750 miles in a day, and live with it far from civilization for weeks, more than doubled the cost of the scope. Even with hydraulics (and my rather brutish physical development) , the scope does become challenging to erect alone in the wilderness for one of 70 years. My grown children have threatened to leave my body rot in a desert until I started bringing Finnegan the dog with me. (They want to get him and the diesel truck back)
So today I'm left with a 14" Celestron Fastar that, with the LOA's, does provide a modest bit of consolation, but I won't test it on the most extended subjects lest I start mourning.
Edited by kennyrichmond, 12 July 2016 - 08:17 PM.